So, this isn't anything major, and this isn't really set in stone. But I'm thinking of trying out AMD. Here is a mock-build, that I think will be good for everyday use, but also good for most games currently.
P.S. I have run benchmarks with these specifications for games like Skyrim, Saints Row: The Third, Modern Warfare 3, and other new games, and it performs at a High Performance, but please tell me anything else you think I should add.
That is a weak graphics card. I wouldn't try to run any of those games with anything under a 6850. (which is 30-40 dollars more) Like jm said^ you could do a pentium sandy bridge which offers superior gaming experience (at stock, although you could overclock that phenom to better performance levels.)
Also do not go with a cheap psu go with a quality reputable brand like corsair, antec, seasonic, pc power&cooling etc...